Laying out tool for making metallic elbows



Oct. 26, 1943.

E. J. GAQTHIER LAYING OUT TOOLS FOR MAKING METALLIC ELBOWS Filed Oct: 14, 1942 2 Sheets-Sheet 1 Oct. 26, 1943. E. J. GAUTHIER 2,332,568

LAYING OUT TOOLS FOR MAKING METALLIC ELBOWS Filed Oct. 14, 1942 2 Sheets-Sheet 2 (i fy; .720

6" J CE 5 DEV LOPED a rpLm Til/5 SOME F'CEN EIPD/ E5 END ARE 0 E #41. OF C T'E7P5 gwwvm Patented Oct. 26, 1943 LAYING OUT TOOL FOR MAKING- METALLIC ELBOWS Edward J. Gauthier; Flint, Mich:- Application October 14, 1942, Serial N6. 462,011

, '7 Claims. 33'-'158) This invention relates to devices for laying out sheet metal work and more particularly to a tool for determining the outlineor pattern ofisheet metal elbows preparatory to cutting and fashioning the metal to form said elbows. 1 u

The object of the inventionis:'toprovide a comparatively simple and inexpensive tool of the class described by means of 'which'; the shape Lor configuration ,of the difierentv pieces of sheet metal necessary to form aselectedelbow or joint can be readily'determined withoutusing a separate plan or profile view of the parts as a guide,

to work from. a v r Y i A further objectofthe invention is to provide an elbow laying out tool comprising aigraduated' rod or bar having spaced scribing sleeves slideably mounted thereon andv adapted to register withsaid graduations for indicating the desired measurementsof the piecesof metal to beacut. i

A further object is to. form'one oimore of the scribing sleeves with an interior collar or bushing. and means for clamping the scribing sleeves in. any. selected position ofrotative adjustment on said collar or'bushing; i a I Astillt further object of the invention is gener ally. to improve this classof devices so as to increasetheir utility, durability andefiiciency.

In the accompanyingwdrawings forming apart of thisspecification and in which similar numerals of reference indicate corresponding parts in all theiigures of the drawings: l

Figure 1 isaside elevation of" an elbow laying outtool embodying the present invention,

Figure 2 is an end elevation, 3

Figure 3 is a. vertical sectionaltview taken: on the line 3-3 of Figure 1,.

Figure 4 is a ide elevation illustrating another Y form of the invention,

Figure 5 is a vertical: sectional view taken on Figure 11 is:an enlarged plan view showing the measurements or graduated marksaon the bar or tube, i v i 1. M vFigure .12 is a. plan view showing a'istrip of metal having the desired measurements thereon and before the same'is cut to form an elbow,

Figurea13 is a side elevation of one of the segments constituting the elbow, and

Figure 14" is an end view thereof.

Referring to Figure 1 of the drawings, 5' indicates a solid bar or red of any desired length and pref erably angular in cross. section, asshown. The-angular faces of the rod 5 are provided with a series of graduations or measurements ii indicating the different lengths of metal strips forming the elbows which may be laid off with the tool, the number of pieces forming each elbow and the radii of said pieces.

for any desired lengthof elbow may be deter-' mined. The bar is also provided with an inclined row of designating. marks 8 from which marks measurements may be determined. Slidablymounted for-longitudinal movemen on the rod orbar 5 are coacting sleeves 9 and I Hi; theinner faces of which are angular in cross section, as indicated at lll," so as to'preven't turn-- ing movementof the sleeves on the bar while at there is illustrateda modified-form oi the invention, in which a hollow rod}ortube 58 1s employed instead of the solid angular part shown in" Figure' 1*. The hollow rod I8 is provided with surface graduation's similar in character tothe graduations shown in Figure 1 of the drawings and which graduations are indicated on an enlarged scale in Figures 6 and 11. p a

SlidabIy mounted on the rod' or tube it are spacedscrib'ing member's [B and 2t and fitting within said scribing members are interior collars or bushings 2i. I The bushings 2-! are free to slide ontn rod 18 but are heldagainst rotative movement with respect thereto by means of keys 22-'fitting1in keyways 23 formedin therodlil, as bestshown Figure 8 0i the drawings." Formed inthebushings 21 are spaced Vz-shaped annular V The bar is further provided with graduations or measurements "i, by

means of whichtheradius of eachpiece of metal The upper portions of the scribing sleeves serve to prevent lateral movement of the scribing sleeves with respect to said bushings. Interposed between each bushing 2i and the rod I3 is a split resilient ring 26, the free ends of which bear against the key 22.

As a means for securing the scribing sleeves in difierent desired positions of rotative adjustment, each sleeve is provided with a clamping screw 2! which extends through a threaded opening in the adjacent sleeve for passage through: V

- which elbows of different sizes and different numbersof pieces can be made quickly without any one of a series of radial openings 28 formed in the bushing 2i for engagement with the clamping ring 25. It will thus be seen that the-bushings and scribing sleeves are slidable as a unit longitudinally of the hollow rod or'tube 18. The a bushings, however, are held against rotative movement on the rod l8 by means of the'keys 22 while the sleeves are free to rotate onv-said bushings and are. locked in adjusted position by means of the clamping screws 2?. ,The sleeves l9 and are provided with scribing points 28 I similar to the scribing points [3 shown in'Figure l-of the drawings. The purpose of the resilient clamping springs 26 is to prevent the inner ends of the clamping screws v27 from, coming in direct contactwith the rod i8 and scratching or otherwise mutilating the measurement graduations thereon. a c i Whenit. is desired to make anelbow of any desired size, as, for instance, an elbow having a six inch diameter and consisting of five pieces,-

designating mark 8 opposite the selected meas-, urements and the clamping screws on both sleeves tightenedto prevent accidental movement of the sleeves. ,The tool is. then positioned on a strip of metal 29 and by means of the scribing points, 23 said metal strip divided into. sixteen spaces, as indicated at 3?] in Figure 12 of the drawings,

said spaces indicating the length of the strip of metal from which the elbow is to be formed.-

The scribing sleeve, 19 is then moved into alinement with the designating character 8 opposite the measurements 6-" 5 pc 6" R and the scribing sleeve 29 moved into vertical alinement with the group of graduationsunder the heading "5 in Figure 6 which graduations indicate having graduations thereon corresponding to the length of'a stripof metal necessa'ryto makei'a' the diameter of the elbow. After the scribing n points are set in this manner, the clamping screws are tightened and the tool moved to a position at substantially right angles to its original position with one of the scribing points on the central line intersecting the transversegline designated 6" in Figure 12 and the other scribing point moved transversely of the strip of metal to the opposite longitudinal margins thereof to determine the circumference of the strip at a selected point or points. In other words, this transverse scribing of the metal strip first starts on the lines 6 and 4, shown in Figure 12. of the drawingathen l and 3, then 8 and .2 and so on.

throughoutth'erange of the measurementsindicated in Figure 6 of the drawings, therebymarking the sheet metal strip-inthe manner sho'wn in Figure 12. marked in this manner, it is severed transversely to form segments which are subsequently rolled into the desired shape and soldered or otherwise united thereby to form the elbowor joint.

The operation of the device shown in Figure After the metal strip has been 7 l is similar to that shown in Figure 4 of the draw employing the usual plan or profile sheet as a guide in cutting and fashioning the metal used,-

inthe construction of said elbows.

It will, of course, be understood that the devices may be made in difierent sizes and shapes and constructed of any suitable material without departing from the spirit of the invention.

Having thus described theiinventio'n, what is;

claimed'as newisz' 1. A tool of the class described comprising-a rod having .graduations thereonicorresponding to the length of av strip"ofsmetal"necessaryflto" make a selected elbow, the number of elbow pieces in said strip and thera'diioi said pieces, spaced .bushings locked. against rotation on the rod but freeto slide thereon, sleevesxmoun'ted for rotation on said bushings and provided with scribing points, and clamping members extending through the sleeves and bushings for holding said-sleevesf-in adjusted position."

2.- A tool of the class describedcomprising .afodt' selected elbow, the number of elbow pieces'in said strip and thecradii ofsaid pieces, coacting bushings free'to slide on said rod.but'locked' against rotative movement, sleevesgmounted for:

rotation on the bushings' and providedwith for clamping the sleeves'in adjusted position.

-3. A tool of the class describedzcomprising a tubular .member' having 'gr'aduations thereon;

spaced bushings slidably mounted on:the tubular member: but: held against rotative movement thereon, said bushings being provided with aplu-V V rality of radiating openings, scribing sleeves. mounted for rotation on the bushings, resilient rings interposed betweenthev bushings andc'thel tubular member, and clamping: screwsicarriedfby the sleeves and adapted to pass through th ad- J'acent openings in the bushings for engagement with the resilient rings tofhold'thejsleevesin' ad justed position.

4. A tool of the class described comprising-a tubular member having graduations thereon;

bushings slidably mountedonthe tubular mem- 5 her but held against rotativevmovement thereon,

said bushings being providediwithoppositelydisposed annular grooves and intermediateradiating openings, scribing sleeves slidably; mounted on the bushings, retaining screwscarriedgjthei sleeves and fitting within the groovesgandclamm ing screws threadedin the sleeves and extending, 5 through the adjacent radiating-openingsfforholdposition on thet1 1b11 ing the sleeves in adjusted lar member.

75. :A tool of the class described comprising};

hollow rod having graduations thereon and provided with a longitudinal key seat, bushings slid ably mounted on the rod and provided with keys fitting within said seat, split rings interposed between the .rod and said bushings, said bushings being provided with spaced substantially V- shaped annular grooves and intermediate radidevices carried by the sleeves and extending through openings in the bushings for clamping said sleeves in a selected position of adjustment on the rod.

'7. A tool of the class described comprising a hollow rod having a longitudinal keyway formed ating openings, sleeves mounted for rotation on the bushings and provided with scribing points, retaining screws threaded in the sleevesand provided with pointed terminals loosely fitting within the grooves, and clamping screws threaded in the sleeves and extending through the adjacent radiating openings for engagement with the rings lateral displacement of said sleeves, and clamping therein, tubular bushings slidably mounted on the rod and provided with keys fitting within the keyway, split resilient rings interposed between the bushings and rod and having their ends bearing against the adjacent keys, said bushings beingprovided with spaced circumferential grooves and intermediate radiating openings, scribing sleeves mounted for rotation on the bushings, res taining screws carried by the sleeves and fitting Within the grooves for preventing lateral displacement of the sleeves with respect to the bushings, and clamping screws threaded in the sleeves and extending throughthe adjacent radiating openings for contact with the split rings for clamping the parts in adjusted position on said rod.

EDWARD J. GAUTHIER- 

